Currency and credit cards
The official currency is the Euro (€). It is not possible to pay in other currencies but there are plenty of ATM / cash machines to withdraw money. In addition most of the restaurants and shops in Rome accept credit cards (but check to be sure).
The most up-to-date exchange rate can be obtained from XE.com Online Currency Converter.
The temperature in Rome in January is cool (average temperature 7 degrees Celsius).
Up-to-date weather information can be obtained from EuroWeather .
Rome is GMT + 1. For details on time zones see Worldclock.
Italy has a 220 volts electricity supply, the sockets are 3 round pins in a row.